upstream: update to pcre2 10.44 release

[darkyzhou]

• Update upstream version to 10.44 in pcre2-sys/update-pcre2.
• Update PCRE2 source to 10.44 (running pcre2-sys/update-pcre2)
• Update bindings (running pcre2-sys/generate-bindings with rust-bindgen 0.70.1)

In 10.44, PCRE2 updates its dependency SLJIT, which brings the support for Loong64, a RISC-style ISA developed by Loongson. As a result, ripgrep can be statically compiled on Loong64 without patches.

Upstream news:
https://github.com/PCRE2Project/pcre2/blob/16d7edb56757e5294eeeecc9a19135aab89a50ba/NEWS#L5C1-L10C73

This is mostly a bug-fix and tidying release. There is one new function, to set
a maximum size for a compiled pattern. The maximum name length for groups is
increased to 128. Some auxiliary files for building under VMS are added.

Upstream changes:
PCRE2Project/pcre2@pcre2-10.43...pcre2-10.44

Upstream changelog:
https://github.com/PCRE2Project/pcre2/blob/29764f94a9bc3ed7fd911d7a1dbfe3a27e61b12d/ChangeLog#L7C1-L35C49